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Acetotrophic sulfate-reducing consortia develop active biofilms on zeolite and glass beads in batch cultures at initial pH 3

  • Environmental Biotechnology
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Abstract

Sulfate-reducing microbial communities remain a suitable option for the remediation of acid mine drainage using several types of carrier materials and appropriate reactor configurations. However, acetate prevails as a product derived from the incomplete oxidation of most organic substrates by sulfate reducers, limiting the efficiency of the whole process. An established sulfate-reducing consortium, able to degrade acetate at initial acidic pH (3.0), was used to develop biofilms over granular activated carbon (GAC), glass beads, and zeolite as carrier materials. In batch assays using glycerol, biofilms successfully formed on zeolite, glass beads, and GAC with sulfide production rates of 0.32, 0.26, and 0.14 mmol H2S/L·d, respectively, but only with glass beads and zeolite, acetate was degraded completely. The planktonic and biofilm communities were determined by the 16S rRNA gene analysis to evaluate the microbial selectivity of the carrier materials. In total, 46 OTUs (family level) composed the microbial communities. Ruminococcaceae and Clostridiaceae families were present in zeolite and glass beads, whereas Peptococcaceae was mostly enriched on zeolite and Desulfovibrionaceae on glass beads. The most abundant sulfate reducer in the biofilm of zeolite was Desulfotomaculum sp., while Desulfatirhabdium sp. abounded in the planktonic community. With glass beads, Desulfovibrio sp. dominated the biofilm and the planktonic communities. Our results indicate that both materials (glass beads and zeolite) selected different key sulfate-reducing microorganisms able to oxidize glycerol completely at initial acidic pH, which is relevant for a future application of the consortium in continuous bioreactors to treat acidic streams.

Key points

Complete consumption of glycerol and acetate at acidic pH by sulfate reduction.

Glass beads and zeolite are suitable materials to form sulfate-reducing biofilms.

Acetotrophic sulfate-reducing bacteria attached to zeolite preferably.

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Data availability

The datasets of the next-generation sequencing are deposited in the NCBI BioProject database with accession number PRJNA646005 (https://www.ncbi.nlm.nih.gov/bioproject/?term=PRJNA646005). All other data generated or analyzed during this study are included in this manuscript (and its supplementary information file).

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Acknowledgements

The authors acknowledge the technical support of Ton van Gelder and Steven Aalvink. The use of the infrastructure of the Laboratory of Microbiology at Wageningen University is gratefully acknowledged. We also thank Dr. Aura Ontiveros, Dr. César Nieto, and the anonymous reviewers for their helpful comments and suggestions that improved the manuscript.

Funding

This research was financially supported by Netherlands Ministry of Education, Culture, and Science and the Netherlands Science Foundation through SIAM Gravitation grant 024.002.002.

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Contributions

All authors contributed significantly to this work. NCQ, LBC, and ISA conceived and designed the experiments. NCQ conducted experiments, analyzed data, and drafted the manuscript. ISA, AJMS, and ERF contributed analytical tools and data analysis. TMP contributed to data inventory and R statistical analysis. All authors analyzed and interpreted data. All authors critically revised the manuscript and approved the final version.

Corresponding authors

Correspondence to Lourdes B. Celis or Irene Sánchez-Andrea.

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The authors declare no competing interests.

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Campos-Quevedo, N., Moreno-Perlin, T., Razo-Flores, E. et al. Acetotrophic sulfate-reducing consortia develop active biofilms on zeolite and glass beads in batch cultures at initial pH 3. Appl Microbiol Biotechnol 105, 5213–5227 (2021). https://doi.org/10.1007/s00253-021-11365-0

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  • DOI: https://doi.org/10.1007/s00253-021-11365-0

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